[Cbc] Cbc Digest, Vol 92, Issue 5

[Yves Touchard]

John,

Determinism is mandatory for our process.
So, any way to control the seed will be appreciate!
Maybe, you could also implement this feature with a command-line 
argument (--randomHeuristicSeed)?

Two other questions:

  * What is the exact use of randomCbcSeed. I don't set it (and did not
    notice and determinism problem) and the default value (-1) seems to
    generate a new seed each time cbc is launched?
  * Setting cutlength to 10000030 leads to determinism problems. Is it
    also expected?

Thanks.

Yves


Le 07/02/2015 18:00, cbc-request at list.coin-or.org a écrit :
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>     1. Re: Determinism with divingV option (John Forrest)
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 06 Feb 2015 17:15:56 +0000
> From: John Forrest <john.forrest at fastercoin.com>
> To: cbc at list.coin-or.org
> Subject: Re: [Cbc] Determinism with divingV option
> Message-ID: <54D4F6CC.2060404 at fastercoin.com>
> Content-Type: text/plain; charset="windows-1252"; Format="flowed"
>
> Yves,
>
> It is to be expected!  When an heuristic is added it is given an initial
> seed for use in generating pseudo random numbers.  This seed is changed
> depending on k for the k'th heuristic.  So adding divingVectorLength
> changes the seed for the RINS heusristic.
>
> If you don't like that, I can easily add an ifdef so
> -DSAME_HEURISTIC_SEED will switch off - in CbcModel:addHeuristic.
>
> John
>
>
>
> On 06/02/15 14:03, Yves Touchard wrote:
>> Hello,
>>
>> I got a determinism problem with the lp file (and maybe others)
>> located here: /https://www.dropbox.com/s/0i7c84lbm2pvyl3/t1.lp?dl=0/.
>> The solution file is different  whether the divingV option is set or not.
>> Command-line is the following:
>>
>> /b//in/cbc t1.lp threads 104 ratio 0.05 cutlength 30 *divingV* on
>> divesolves 301 multiple 1 branch printingOptions rows solution t1_0.sol/
>>
>> Solution files are located here:
>>
>>    * Without -> /https://www.dropbox.com/s/zcu8kwv9ukipaqe/t1_0.sol?dl=0/
>>    * With -> /https://www.dropbox.com/s/jc1co4yeg9i13vw/t1_1.sol?dl=0/
>>
>> I tried with both trunk revision 2102 and 2128.
>> Could you tell if it is an expected behaviour or not?
>>
>> Thanks & Regards
>>
>> Yves
>>
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